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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6880cf50bc3ba6b934cfbcd003429ae9a90aa2a053be7f744c43ffb8f10df903' 
  AND token = '54epHDEOaBQf5rbU52S1XnD9S7Wj/n4dZxR6or51Pck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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