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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '947b47cf45c24529c4e5536bedbad83142504a6abb9253a209fdaf61de831e08' 
  AND token = 'FPx7buv3HCcZ5ka5xiSHne7K71qGcKN58+9KeXm0djs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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