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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a80fd21ad87db280059ad4e44a801f0d6d957a03fd0253c5751d40e8ddb3160d' 
  AND token = 'tzCYMp1H+BcxzWRve4aoHP9IkPe4oO6AyRZpcZjQz8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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