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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33b0cc1d8a52335bc5e7842e899c322f40862559a4eb10db24522a708d70beb' 
  AND token = 'SdXgCvEFJoUA6Kn48gtEqoc6hmcc2pursDI9E2j163g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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