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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92506335d5f38efba819f4e20712d458639b3c8e1113e45ed6d2ce8b0c02ef65' 
  AND token = 'VeGaSpQBMFN9suZYPiUOJvQZ4fQiDqk7V3q1P4dclio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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