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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b593cf045d6863ab674eee1dd315f9af92034263abd5722dcfc4ab9170aa79f2' 
  AND token = 'QGfL8jfnzuXAe1CQLEjs7wScUD+do2UZAUXu4D9q5XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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