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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd26e725a6485a820aec969999819883ce16c7cbe52b6e753ed727ef207a06bf' 
  AND token = 'xJEqkOZT/T2u+B5n2SvNvfc7smnERqo2WZ0GPIgzhIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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