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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c81a3ee540cfbb9b5b3e586e27236396d217fbad32aeec0ab4019d1cc66b6dd' 
  AND token = '10f9++9ql7lWOr6iLvwB70Kull45bshctUett49TVw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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