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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ce7a147ac5756da574b071fb85a5d003e4d50f7932e068be9476a789acbfde8' 
  AND token = 'h2cJPlwuI35G7ltG4nlJQdaE8O6f21vuCaUk/IExmMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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