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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3408f590e33ae0b7f0176cf9351b5254e4ca01f589713d029422d2d9a19343e1' 
  AND token = 'xk9Bmb94LkDjHdaqK33V1Fh59cm4i0nBPQRXmeyEze8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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