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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c281f0304e99609c4f1d9932d633843b39d7e8a6a07bf62cf3c2d475096cc76' 
  AND token = 'zecCy37jW+N00LmZxt+ygLXLEQ9HM9abOwgY5kqw0ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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