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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38021cdce20213272d4432cd7b9d5f9e7dcbba0f88deab0e607905a21d74b5d' 
  AND token = 'eX0066IxtfYjr3UF/blnbTDtwOdFKRLxStnZBp5PdPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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