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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ed833124522cbe973c8bf1138afb5be3f13e2ce5152c0eded4ca98e26d42583' 
  AND token = '/28dUf/Lad9F9Xj702uAyQnKpLUjNFmip9L7IIP00wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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