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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067b0f9aff0b163bbadb6bbc1c30afe657d1baf5229aae3464edbb3cef3f7b6f' 
  AND token = 'LxL51HwadAfurE6gK5s1QT2t4IUNOtgIfGRt6i23euY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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