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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0999b5bbeec53dca1366332425f516c62af58f3acc43f74b70c8670d13460f' 
  AND token = 'Yga8vxn53jPd8uvfi5JjjLSR1pbi1NraTTZwVPtGaGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00145

JSON explain

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