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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcacbc62a40cdaaf056b3b135b289b5cebd465ce329c26af1b21a6f951b3af77' 
  AND token = 'FAndsBoNI7hukf3dAiR+ZnFDdHEBG1SlwFjT4rKGL5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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