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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d5e02ff629adc7d6de86f63953902fb9a5f331222d33727eb550e7486f3ba6' 
  AND token = 'W/3XZPlI2bgvm2f888MR3sf5GO4ied3gLtnQ5tlbNGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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