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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '996de2e1c2bf126d9e432909ba17c2bedacc271b86e5e76ab6383dc7eb266df9' 
  AND token = 'ZL1OO/fHVGso5faJB0FG5QGkICf9vwye9gxSQadDC4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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