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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87825c568163d0e3e572ccf0f5724345d443404a95a223bd6a3aa8654d1b6cfa' 
  AND token = 'pbDBieU2mSPmlYMUN/bFhrov94vYYjIbOreQP1j6a7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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