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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0de2498f6676aaf96f8baf517ad6f04fe48252d5a83ee1db9277f745ff3f464c' 
  AND token = 'hDIWvblP5O51CcY+skM+5ySKeCwfAcv4B/x7hosjUqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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