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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7066e4988c9c54a624b54d0fbc198433c11b438b6237a32dda72fcbac1e4309e' 
  AND token = 'qThIkADYapIUzneRd0v0KcIq6z2m2XMUW/wFZwIYPeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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