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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8808964f286baddcd128ec1c468a082f719f96d1d884d513a0878e4f39370a66' 
  AND token = '0D8qfrbqT6vSUesj1HRCQLtRETJhhsxd735tKRl5FRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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