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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50649eb71b9d2a1154381341fe269c176080912bd450e2dbb76c73eaef813da3' 
  AND token = 'fOmqKsU/pLjkXSDt0yvtNt7FEa2nWzbYAZ7WAlJwt6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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