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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f935db7250ee1e00dcee83c2c713c27be32123dca7d2d78e2a4c4cf8879ed0' 
  AND token = '4QNaQhzJH5BvClOzspJM2J3RMEdv1tgWDf/rEtCeg/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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