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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98f056761c0177b1ac13a58cbe054d7e0a89d55d4c865937967198fd1e4fe03' 
  AND token = 'ri7ecKSvMoOKK3BwSkG//R0JcEhKTn32IVbv1OFfvcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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