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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2231a7934bca2b2d33761eafc1a1e60c902c63ab9558f08fb6645b0288a098b4' 
  AND token = 'VYcq4NdNt9q8/L69NMHeOyiACX/WBbjgYtEcKweOrtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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