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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82ede9748582ffedb4544c9483d7ffb6b58d347fe3590cf49b941907cca7b9a' 
  AND token = 'tCjj/QuRff+i7EQe8XYWltOP1dzgfYd46SW3tW1dLjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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