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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e598b7c4ee9293451056291d23d738c30cf24b65ce29303c62bf67bd9ec1fc1' 
  AND token = 'kl2q/YxpheXBJeKoYNvd3eQ1DhDAIjO75my5/wS0YyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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