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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3795fe582bd1aeecf6326e9812f822370ff21c48a3aa9f9e7ac2f5567e51e97' 
  AND token = '6W9KeIa3BxvISGjC+PIPZa9S3MhIYRBq/ys1qhUaIyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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