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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6fa13a93ea6bdaf4f5c5879ce5eca3ee7f27fc1fddf236f7159036084a52dd' 
  AND token = '4rUgZl/Fan+QGon5RgtKZIHVdU+QDXJac+tokKNpaDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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