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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68361eb1d6d873ec0aefe63a9941bf6c2a57937957357a3593531c2f645b6032' 
  AND token = 'Vv7S32JdoW3YgJLzTCNglz1vT02b+7mze9uabvXT7fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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