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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4acdf0920cad1e4d6e5e446509a00ec0b1b2c828321a21d04db87807724c6e2' 
  AND token = 'oe2igvosvfMnsDOp0Y2tPxXUkoF89mT6vM/3PihyZqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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