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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4cfb4471aa8d9aa444f894a343639c7961489100d2be86e2d91f6162b33e689' 
  AND token = '6zlujudzJE3UG+ALfE3Hs6ao6lSbrxO7nz7TI0V+CLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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