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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cd0927d4651fba84275f1ed85b83e2c88323d0ea9f55f93518cd26bd7fd4c6' 
  AND token = '5N5sNiBJB4sWJYIfv7CriPn2gr/czXUKg9KKx3brimU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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