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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfbbaf96b30ac77cf7d0540d9a4fa41acaf46431f912062e7aae87660f4fc8ab' 
  AND token = 'fMA/lX3a2cdZyTRiXHEHlbIc1TB9SVJmPPv9FyzmrYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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