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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60d024b2d840f9c4cc7407ea2465f97cbd9400d6b67752642c921f0ce7b9410' 
  AND token = 'j8+X7TgqLaSfdJZIGLbLH3JYA0i/eSOghpsDT1H/HWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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