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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a85a25e505bef0c086be5001dbde25686d8bcc26a97645c56822758914d76ce' 
  AND token = 'ThxnHXlwtGro1CS65vgwNj19eMASsJ4S2oLqV6g1iSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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