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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc35074e22e59d6ef9eb6b27eb06b681ca911e566c7aaaf9f1e15baa9afbd4c' 
  AND token = 'ng6wPiJVrlw7jNbXQZ8e/cBCNq5ffsTW4cCoQfUUuCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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