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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0960a1bdfd4f72f26157378f7ab5d6693fe13038580f8b3acf6e448fe24e79f1' 
  AND token = 'mfhTqeO2gkLehJjeiVbDO8pRZP9x5rgRdhMxkM7hFt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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