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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e05d9213d521241047bc7f43b7fb2c275b19002f93fa3951594476a33c08bfad' 
  AND token = 'MKtSlMkCX9zOq7EMM/aqca/HhUiba+5ksxMtaLmzvgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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