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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f785cf3320eed532dbda11d071f67703c414b84f58904b91795e3f2c769ae4a3' 
  AND token = 'imFaXclofWyrw5S/Lou0mkZSQSaw4Ne0IgNJQdwrsdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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