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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0565dfe257a3efc2df8bc106e19a2b51fa059541f4f535c6ecb56c1c199b769e' 
  AND token = 'fUWdS++p1lOCHl/42BgqbF6OkPLTULIE+ylnxn8svTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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