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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d38cafb9540bda929ce0cbe4337f965851e7c32e140c21b33c0b08065ba5395' 
  AND token = 'wCZcurueiB/jsrAbI3EfOnOINtglFgGswnCdwOHx1gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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