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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5725379d42a09eba5ec36cb0ecd37ed7b5a9dac9ca1d716492a9ed91fe4556' 
  AND token = 'n3N9IXWeK3U/kwpDVq7aniuutPw9we6cBprMwaB4E7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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