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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5038157380011bf3b3a64bb838b906d7b72a18a74c57c35e476979d86084a87' 
  AND token = '6dG2ZFN6mLlEcP3W9HP1Tdp7p8Ct7InwLon1xO3TCss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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