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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6959a843f80b18ac570d2e47b48098ab1b91c628fd93662176a0e7caccc06f4' 
  AND token = 'oVC9XQlGIjoTw/lDHR0M9X4r4rE29cuXTCOTGn5qAqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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