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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c318f8fdc7e6afca8a93ea59cd114c7147948b3def0ec70d83be12a95fc97e4' 
  AND token = '7uHgbmyxA49nkjva/PAxeRe23vgcEWa4q2zMamSbHjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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