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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180193e12a421ce94dd8ab93a0c6678b8e12f429892fe6af5d403eddf0d591d4' 
  AND token = '9VIfu/A/W1Xy3ykdO1xx8LQs3KCD/Nd0JbpsYgyilNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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