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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e155959ae72ddd53e9ee58adb261fa53ed30b618b6e57dc84f8e001fe17e783b' 
  AND token = 'rc+qGGRGbMON7xFqZ4qjHfgkJVd27ITt08FUi1ja4O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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