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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56f7c73826e3b7086e8123cff25992a0f24d5cce1481b30fa23e91f8332a1f3b' 
  AND token = 'eEv0BIfibD2Kgdg3r4HVZ5WAf1RfSTCrs4rW5+EgZ6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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