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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3056c8b9947d7b31915a30d570422dfc3d74d423020164fb36d76b1618c2795' 
  AND token = '4UKHdmM5ea8kyrikZs20eLdA1eNISV7J5jSGHeFduHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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