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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '385a892591b32b7d636a9bf49811cc609aa895a50c80a95a5a557a5b0918ebf2' 
  AND token = 'xPsl4ZnxYjiDbg35kI4PR9xiw6tjzxIRR9d8GqxebPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00129

JSON explain

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