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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c315a937d11d0b8780cf22de9c92c2faa3b2ee5827b9d017505cca54ecf932f' 
  AND token = 'JOb7MS5QsbO4BstxUiQ/xfK1fKJllOea+Otc4wyNW18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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