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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a346323fffa5b2d0073f99d944737ec5161e1f3b865018eaf233067b1b78cd96' 
  AND token = 'hAHwFD7Sd1wA111lI82DdntKg9T9oEJknot2pD9tNag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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