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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5db285e9cc770bd11c19bf226c3c0a9cb035476c734eef2dd92291de599a88b' 
  AND token = 'oLCGDmGM8663/cnTLo6hNPSy+TsAGoBceTrefFZA0Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}