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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732532be9e8506374c7dd29d569b59e6ceae478afd7bf80711d959c6ab312b7b' 
  AND token = '/pv2Of4pTjUPz8C5Q1wSQ4QC8dE/J/0lbRuLXrdnkB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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