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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7544d2c4a48070514ce47c18bbc5a8542995834dd44d7869b614e9c7e0d92b1c' 
  AND token = '14LMxydqdcRzKLCp8mBP2l0tp4Oc+8yoWBYOItImIUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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