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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0978b7b98531c4f4244cb68cddfa8f6186eb7a402ca77dc6c0423a0c5989ed2' 
  AND token = '0lh1j8QMQo/J981BueJ5wOgj3LhRez9bYjSQ7oERkqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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