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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23313bd1878f2d8030bab495fe6df3b8ca4fffcff04cd42313fe260ec5222ea' 
  AND token = 'jLw/Q1UkH+Y7evB2LvrGZia4y56Rvh2CqXins390pH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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