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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c7c53cb99e18a0a0ebb73157940da6d287a54f4ff8b59c06a9722513a5d11a1' 
  AND token = '6WblrydoPmO+yWsxTRuOJgDE0llfYWvMJ4pJIM4U3KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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